Patent attributes
A laminate sheet material punching method, in which a part of a cover sheet is punched from a laminate sheet material including the cover sheet which has an adhesive film formed at one surface thereof and is adhered to a recording side of a disk substrate of an optical disk via the adhesive film, a strip-off sheet adhered to a surface of the adhesive film on the cover sheet and a protective sheet adhered to the opposite surface of the cover sheet, in a shape corresponding to a shape of the recording side of the disk substrate, the laminate sheet material punching method includes the steps of: pressing a punching blade whose blade tip extends along a path corresponding to the peripheral edge of the recording side of the disk substrate, against the surface of the strip-off sheet; cutting the strip-off sheet and the cover sheet with the punching blade.
